Add badge 'on vcpkg' (nonstd-lite-project issue 72)

martinmoene/nonstd-lite-project#72

README.md

@@ -1,6 +1,6 @@
 # observer_ptr<> for C++98 up
 
-[![Language](https://img.shields.io/badge/C%2B%2B-98/11/14/17-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization) [![License](https://img.shields.io/badge/license-BSL-blue.svg)](https://opensource.org/licenses/BSL-1.0) [![Build Status](https://github.com/martinmoene/observer-ptr-lite/actions/workflows/ci.yml/badge.svg)](https://github.com/martinmoene/observer-ptr-lite/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/6icjotc617wmhljt/branch/master?svg=true)](https://ci.appveyor.com/project/martinmoene/observer-ptr/branch/master) [![Version](https://badge.fury.io/gh/martinmoene%2Fobserver-ptr.svg)](https://github.com/martinmoene/observer-ptr/releases) [![download](https://img.shields.io/badge/latest-download-blue.svg)](https://raw.githubusercontent.com/martinmoene/observer-ptr/master/include/nonstd/observer_ptr.h) [![Conan](https://img.shields.io/badge/on-conan-blue.svg)](https://conan.io/center/observer-ptr-lite) [![Try it online](https://img.shields.io/badge/on-wandbox-blue.svg)](https://wandbox.org/permlink/31XA2ReBGNDnplYK) [![Try it on godbolt online](https://img.shields.io/badge/on-godbolt-blue.svg)](https://godbolt.org/z/jwVx39)
+[![Language](https://img.shields.io/badge/C%2B%2B-98/11/14/17-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization) [![License](https://img.shields.io/badge/license-BSL-blue.svg)](https://opensource.org/licenses/BSL-1.0) [![Build Status](https://github.com/martinmoene/observer-ptr-lite/actions/workflows/ci.yml/badge.svg)](https://github.com/martinmoene/observer-ptr-lite/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/6icjotc617wmhljt/branch/master?svg=true)](https://ci.appveyor.com/project/martinmoene/observer-ptr/branch/master) [![Version](https://badge.fury.io/gh/martinmoene%2Fobserver-ptr.svg)](https://github.com/martinmoene/observer-ptr/releases) [![download](https://img.shields.io/badge/latest-download-blue.svg)](https://raw.githubusercontent.com/martinmoene/observer-ptr/master/include/nonstd/observer_ptr.h) [![Conan](https://img.shields.io/badge/on-conan-blue.svg)](https://conan.io/center/observer-ptr-lite) [![Vcpkg](https://img.shields.io/badge/on-vcpkg-blue.svg)](https://vcpkg.link/ports/observer-ptr-lite) [![Try it online](https://img.shields.io/badge/on-wandbox-blue.svg)](https://wandbox.org/permlink/31XA2ReBGNDnplYK) [![Try it on godbolt online](https://img.shields.io/badge/on-godbolt-blue.svg)](https://godbolt.org/z/jwVx39)
 
 *observer-ptr* is a single-file header-only library with a variant of std::experimental::observer_ptr [[1](#ref1)] for C++98 and later.